Tyler Hilinski #3 of the Washington State Cougars passes the ball against the Michigan State Spartans during the first half of the SDCCU Holiday Bowl at SDCCU Stadium on December 28, 2017 in San Diego, California

Authorities say Washington State quarterback Tyler Hilinski has died after an apparent self-inflicted gunshot wound to the head.

Hilinski, 21, was found dead in a Pullman, Wash., apartment Tuesday. Police say a rifle was found next to Hilinski's body, and suicide note was also discovered.

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Hilinski just completed his sophomore season with the Cougars and was the presumptive starting quarterback going into next season. Hilinski started Washington State’s Holiday Bowl loss to Michigan State after Luke Falk was unable to play due to a wrist injury.

Washington State president Kirk Schulz tweeted, “Our thoughts and prayers are with the Hilinski family.”